Multi-mode transmitter circuit for switching over between TDMA mode and CDMA mode

Abstract

A multi-mode transmitter circuit is provided for selectively switching over between a TDMA mode and a CDMA mode, where a transmission frequency of the CDMA mode is substantially identical to a transmission frequency of the TDMA mode. In the TDMA and CDMA modes, a filter device attenuates frequency band components other than a transmission frequency band of a phase-modulated signal, and filters an attenuated phase-modulated signal to pass therethrough a filtered phase-modulated signal. In the TDMA mode, an amplitude modulator generates a transmitting radio signal by modulating an amplitude of the phase-modulated signal according to an amplitude component of the inputted signal to be modulated, and in the CDMA mode, the amplitude modulator outputs the phase-modulated signal as a transmitting radio signal.

1 . A multi-mode transmitter circuit for selectively switching over between at least one TDMA mode and at least one CDMA mode, a transmission frequency of the CDMA mode being substantially identical to that of the TDMA mode, said circuit comprising: 
 a phase modulating device for, in the TDMA mode and the CDMA mode, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a filtering device for, in the TDMA mode and the CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal; and    an amplitude modulating device for executing the following steps of:    (a) in the TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal; and    (b) in the CDMA mode, outputting the phase-modulated signal outputted from said filtering device as a transmitting radio signal.    
     
     
         2 . A multi-mode transmitter circuit for selectively switching over between a plurality of TDMA modes including first and second TDMA modes that are different from each other and at least one CDMA mode, a transmission frequency of the CDMA mode being substantially identical to that of the first TDMA mode, said circuit comprising: 
 a first phase modulating device for, in the first TDMA mode and the CDMA mode, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a second phase modulating device for, in the second TDMA mode, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to the inputted signal to be modulated, and outputting the phase-modulated signal;    a filtering device for, in the first TDMA mode and the CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said first phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal;    a first amplitude modulating device for executing the following steps of:    (a) in the first TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal; and    (b) in the CDMA mode, outputting the phase-modulated signal outputted from said filtering device as a transmitting radio signal; and    a second amplitude modulating device for, in the second TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said second phase modulating device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal.    
     
     
         3 . The multi-mode transmitter circuit as claimed in  claim 2 , wherein said first amplitude modulating device and said second amplitude modulating device shares one amplitude modulating device.  
     
     
         4 . A multi-mode transmitter circuit for selectively switching over between a plurality of TDMA modes including first and second TDMA modes that are different from each other and a plurality of CDMA modes including first and second CDMA modes that are different from each other, transmission frequencies of the first and second CDMA modes being substantially identical to those of the first and second TDMA modes, respectively, said circuit comprising: 
 a phase modulating device for, in the first and second TDMA modes and the first and second CDMA modes, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a first filtering device for, in the first TDMA mode and the first CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal;    a second filtering device for, in the second TDMA mode and the second CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal; and    an amplitude modulating device for executing the following steps of:    (a) in the first TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said first filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal;    (b) in the second TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said second filtering device according to the amplitude component of an inputted signal to be modulated, and outputting the transmitting radio signal;    (c) in the first CDMA mode, outputting the phase-modulated signal outputted from said first filtering device as a transmitting radio signal; and    (d) in the second CDMA mode, outputting the phase-modulated signal outputted from said second filtering device as a transmitting radio signal.    
     
     
         5 . A multi-mode transmitter circuit for selectively switching over between a plurality of TDMA modes including first and second TDMA modes, and a plurality of CDMA modes including first and second CDMA modes that are different from each other, 
 wherein a transmission frequency of the second TDMA mode is substantially half a transmission frequency of the first TDMA mode, and transmission frequencies of the first and second CDMA modes are substantially identical to those of the first and second TDMA modes, respectively,    wherein said circuit comprises:    a phase modulating device for, in the first and second TDMA modes and the first and second CDMA modes, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a frequency dividing device for dividing a frequency of the phase-modulated signal outputted from said phase modulating device into half the frequency thereof, and outputting a frequency-divided phase-modulated signal;    a first filtering device for, in the first TDMA mode and the first CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal;    a first amplitude modulating device for executing the following steps of:    (a) in the first TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said first filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal; and    (b) in the first CDMA mode, outputting the phase-modulated signal outputted from said first filtering device as a transmitting radio signal; and    a second amplitude modulating device for executing the following steps of:    (a) in the second TDMA mode, generating a transmitting radio signal by modulating an amplitude of the frequency-divided phase-modulated signal outputted from said frequency dividing device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal; and    (b) in the second CDMA mode, outputting the frequency-divided phase-modulated signal outputted from said frequency dividing device as a transmitting radio signal.    
     
     
         6 . A multi-mode transmitter circuit for selectively switching over between a plurality of TDMA modes including first, second, third and fourth TDMA modes, and a plurality of CDMA modes including first and second CDMA modes that are different from each other, 
 wherein a transmission frequency of the second TDMA mode is substantially half a transmission frequency of the first TDMA mode,    wherein a transmission frequency of the third TDMA mode is shifted from that of the first TDMA mode by a predetermined first frequency shift amount,    wherein a transmission frequency of the fourth TDMA mode is shifted from that of the second TDMA mode by a predetermined second frequency shift amount,    wherein transmission frequencies of the first and second CDMA modes are substantially identical to the transmission frequencies of the first and second TDMA modes, respectively, and    wherein said circuit comprises:    a first phase modulating device for, in the first and second TDMA modes and the first and second CDMA modes, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a second phase modulating device for, in the third and fourth TDMA modes, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to the inputted signal to be modulated, and outputting the phase-modulated signal;    a first frequency dividing device for dividing a frequency of the phase-modulated signal outputted from said first phase modulating device into half the frequency thereof, and outputting a frequency-divided phase-modulated signal;    a second frequency dividing device for dividing a frequency of the phase-modulated signal outputted from said second phase modulating device into half the frequency thereof, and outputting a frequency-divided phase-modulated signal;    a first filtering device for, in the first TDMA mode and the first CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said first phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal;    a first amplitude modulating device for executing the following steps of:    (a) in the first TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said first filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal;    (b) in the first CDMA mode, outputting the phase-modulated signal outputted from said first filtering device; and    (c) in the third TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said second phase modulating device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal;    a second filtering device for, in the second TDMA mode and the second CDMA mode, attenuating frequency band components other than a transmission frequency band of the frequency-divided phase-modulated signal outputted from said first frequency dividing device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal; and    a second amplitude modulating device for executing the following steps of:    (a) in the second TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said second filtering device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal;    (b) in the second CDMA mode, outputting the phase-modulated signal outputted from said second filtering device; and    (c) in the fourth TDMA mode, generating a transmitting radio signal by modulating an amplitude of the frequency-divided phase-modulated signal outputted from said second frequency dividing device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal.    
     
     
         7 . The multi-mode transmitter circuit as claimed in  claim 1 , 
 wherein each of said filtering device is one of a band-pass filter and a band stop filter.    
     
     
         8 . A multi-mode transceiver circuit comprising: 
 a multi-mode transmitter circuit for selectively switching over between at least one TDMA mode and at least one CDMA mode, a transmission frequency of the CDMA mode being substantially identical to that of the TDMA mode; and    a multi-mode receiver circuit for, in the respective TDMA modes and the respective CDMA modes, receiving a radio signal, frequency-converting a received radio signal, and demodulating a frequency-converted received radio signal,    wherein said multi-mode transmitter circuit comprises:    a phase modulating device for, in the TDMA mode and the CDMA mode, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a filtering device for, in the TDMA mode and the CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal; and    an amplitude modulating device for executing the following steps of:    (a) in the TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal; and    (b) in the CDMA mode, outputting the phase-modulated signal outputted from said filtering device as a transmitting radio signal.    
     
     
         9 . The multi-mode transceiver circuit as claimed in  claim 8 , 
 wherein the multi-mode receiver circuit uses one of phase-modulated signals outputted from said respective phase modulating devices as a local oscillation signal for the frequency conversion.    
     
     
         10 . A multi-mode transceiver circuit comprising: 
 a multi-mode transmitter circuit for selectively switching over between a plurality of TDMA modes including first and second TDMA modes that are different from each other and at least one CDMA mode, a transmission frequency of the CDMA mode being substantially identical to that of the first TDMA mode; and    a multi-mode receiver circuit for, in the respective TDMA modes and the respective CDMA modes, receiving a radio signal, frequency-converting a received radio signal, and demodulating a frequency-converted received radio signal,    wherein said multi-mode transmitter circuit comprises:    a first phase modulating device for, in the first TDMA mode and the CDMA mode, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a second phase modulating device for, in the second TDMA mode, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to the inputted signal to be modulated, and outputting the phase-modulated signal;    a filtering device for, in the first TDMA mode and the CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said first phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal;    a first amplitude modulating device for executing the following steps of:    (a) in the first TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal; and    (b) in the CDMA mode, outputting the phase-modulated signal outputted from said filtering device as a transmitting radio signal; and    a second amplitude modulating device for, in the second TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said second phase modulating device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal.    
     
     
         11 . The multi-mode transceiver circuit as claimed in  claim 10 , 
 wherein the multi-mode receiver circuit uses one of phase-modulated signals outputted from said respective phase modulating devices as a local oscillation signal for the frequency conversion.    
     
     
         12 . A multi-mode transceiver circuit comprising: 
 a multi-mode transmitter circuit for selectively switching over between a plurality of TDMA modes including first and second TDMA modes that are different from each other and a plurality of CDMA modes including first and second CDMA modes that are different from each other, transmission frequencies of the first and second CDMA modes being substantially identical to those of the first and second TDMA modes, respectively; and    a multi-mode receiver circuit for, in the respective TDMA modes and the respective CDMA modes, receiving a radio signal, frequency-converting a received radio signal, and demodulating a frequency-converted received radio signal,    wherein said multi-mode transmitter circuit comprises:    a phase modulating device for, in the first and second TDMA modes and the first and second CDMA modes, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a first filtering device for, in the first TDMA mode and the first CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal;    a second filtering device for, in the second TDMA mode and the second CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal; and    an amplitude modulating device for executing the following steps of:    (a) in the first TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said first filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal;    (b) in the second TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said second filtering device according to the amplitude component of an inputted signal to be modulated, and outputting the transmitting radio signal;    (c) in the first CDMA mode, outputting the phase-modulated signal outputted from said first filtering device as a transmitting radio signal; and    (d) in the second CDMA mode, outputting the phase-modulated signal outputted from said second filtering device as a transmitting radio signal.    
     
     
         13 . The multi-mode transceiver circuit as claimed in  claim 12 , 
 wherein the multi-mode receiver circuit uses one of phase-modulated signals outputted from said respective phase modulating devices as a local oscillation signal for the frequency conversion.    
     
     
         14 . A multi-mode transceiver circuit comprising: 
 a multi-mode transmitter circuit for selectively switching over between a plurality of TDMA modes including first and second TDMA modes, and a plurality of CDMA modes including first and second CDMA modes that are different from each other; and    a multi-mode receiver circuit for, in the respective TDMA modes and the respective CDMA modes, receiving a radio signal, frequency-converting a received radio signal, and demodulating a frequency-converted received radio signal,    wherein a transmission frequency of the second TDMA mode is substantially half a transmission frequency of the first TDMA mode, and transmission frequencies of the first and second CDMA modes are substantially identical to those of the first and second TDMA modes, respectively, and    wherein said multi-mode transmitter circuit comprises:    a phase modulating device for, in the first and second TDMA modes and the first and second CDMA modes, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a frequency dividing device for dividing a frequency of the phase-modulated signal outputted from said phase modulating device into half the frequency thereof, and outputting a frequency-divided phase-modulated signal;    a first filtering device for, in the first TDMA mode and the first CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal;    a first amplitude modulating device for executing the following steps of:    (a) in the first TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said first filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal; and    (b) in the first CDMA mode, outputting the phase-modulated signal outputted from said first filtering device as a transmitting radio signal; and    a second amplitude modulating device for executing the following steps of:    (a) in the second TDMA mode, generating a transmitting radio signal by modulating an amplitude of the frequency-divided phase-modulated signal outputted from said frequency dividing device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal; and    (b) in the second CDMA mode, outputting the frequency-divided phase-modulated signal outputted from said frequency dividing device as a transmitting radio signal.    
     
     
         15 . The multi-mode transceiver circuit as claimed in  claim 14 , 
 wherein the multi-mode receiver circuit uses one of phase-modulated signals outputted from said respective phase modulating devices and frequency-divided phase-modulated signals outputted from said respective frequency dividing devices as a local oscillation signal for the frequency conversion.    
     
     
         16 . A multi-mode transceiver circuit comprising: 
 a multi-mode transmitter circuit for selectively switching over between a plurality of TDMA modes including first, second, third and fourth TDMA modes, and a plurality of CDMA modes including first and second CDMA modes that are different from each other; and    a multi-mode receiver circuit for, in the respective TDMA modes and the respective CDMA modes, receiving a radio signal, frequency-converting a received radio signal, and demodulating a frequency-converted received radio signal,    wherein a transmission frequency of the second TDMA mode is substantially half a transmission frequency of the first TDMA mode,    wherein a transmission frequency of the third TDMA mode is shifted from that of the first TDMA mode by a predetermined first frequency shift amount,    wherein a transmission frequency of the fourth TDMA mode is shifted from that of the second TDMA mode by a predetermined second frequency shift amount,    wherein transmission frequencies of the first and second CDMA modes are substantially identical to the transmission frequencies of the first and second TDMA modes, respectively, and    wherein said multi-mode transmitter circuit comprises:    a first phase modulating device for, in the first and second TDMA modes and the first and second CDMA modes, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a second phase modulating device for, in the third and fourth TDMA modes, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to the inputted signal to be modulated, and outputting the phase-modulated signal;    a first frequency dividing device for dividing a frequency of the phase-modulated signal outputted from said first phase modulating device into half the frequency thereof, and outputting a frequency-divided phase-modulated signal;    a second frequency dividing device for dividing a frequency of the phase-modulated signal outputted from said second phase modulating device into half the frequency thereof, and outputting a frequency-divided phase-modulated signal;    a first filtering device for, in the first TDMA mode and the first CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said first phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal;    a first amplitude modulating device for executing the following steps of:    (a) in the first TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said first filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal;    (b) in the first CDMA mode, outputting the phase-modulated signal outputted from said first filtering device; and    (c) in the third TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said second phase modulating device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal;    a second filtering device for, in the second TDMA mode and the second CDMA mode, attenuating frequency band components other than a transmission frequency band of the frequency-divided phase-modulated signal outputted from said first frequency dividing device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal; and    a second amplitude modulating device for executing the following steps of:    (a) in the second TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said second filtering device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal;    (b) in the second CDMA mode, outputting the phase-modulated signal outputted from said second filtering device; and    (c) in the fourth TDMA mode, generating a transmitting radio signal by modulating an amplitude of the frequency-divided phase-modulated signal outputted from said second frequency dividing device according to the amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal.    
     
     
         17 . The multi-mode transceiver circuit as claimed in  claim 16 , 
 wherein the multi-mode receiver circuit uses one of phase-modulated signals outputted from said respective phase modulating devices and frequency-divided phase-modulated signals outputted from said respective frequency dividing devices as a local oscillation signal for the frequency conversion.    
     
     
         18 . A radio communication apparatus comprising: 
 a multi-mode transmitter circuit for selectively switching over between at least one TDMA mode and at least one CDMA mode, a transmission frequency of the CDMA mode being substantially identical to that of the TDMA mode;    a multi-mode receiver circuit for, in the respective TDMA modes and the respective CDMA modes, receiving a radio signal, frequency-converting a received radio signal, and demodulating a frequency-converted received radio signal; and    an antenna for transmitting and receiving a radio signal,    wherein said multi-mode transmitter circuit comprises:    a phase modulating device for, in the TDMA mode and the CDMA mode, generating a phase-modulated signal by modulating a phase of a carrier wave signal according to an inputted signal to be modulated, and outputting the phase-modulated signal;    a filtering device for, in the TDMA mode and the CDMA mode, attenuating frequency band components other than a transmission frequency band of the phase-modulated signal outputted from said phase modulating device, and filtering an attenuated phase-modulated signal to pass therethrough and output a filtered phase-modulated signal; and    an amplitude modulating device for executing the following steps of:    (a) in the TDMA mode, generating a transmitting radio signal by modulating an amplitude of the phase-modulated signal outputted from said filtering device according to an amplitude component of the inputted signal to be modulated, and outputting the transmitting radio signal; and    (b) in the CDMA mode, outputting the phase-modulated signal outputted from said filtering device as a transmitting radio signal,    wherein the multi-mode receiver circuit receives a received radio signal received by said antenna, converts a frequency of the received radio signal, and demodulates a frequency-converted received radio signal, and    wherein said multi-mode transmitter circuit outputs the transmitting radio signal outputted from said multi-mode transmitter circuit to said antenna so as to radiate the transmitting radio signal through said antenna.    
     
     
         19 . The radio communication apparatus as claimed in  claim 18 , 
 wherein the multi-mode receiver circuit uses one of phase-modulated signals outputted from said respective phase modulating devices as a local oscillation signal for the frequency conversion.